Linamarin

Cyanogenic glycosides also occur naturally in many plant species, with stones or pits like peaches, plums, or apricots, and the seeds of apple contain amygdalin, which is a cyanide precursor.

Linamarine is another cyanogenic glycoside, and that's present in high concentrations of cassava.

Now, here's an interesting historical fact about today's product packaging and cyanide.

In 1982, seven people died in the greater Chicago area after cyanide was substituted into acetaminophen capsules sold in stores.